Closure-flap for envelops.



M. VIBRENGEL.

GLOSUBE FLA? POR ENVELOPS.

Arnxonxox rum) man ao. 191s.

1,112,178. Patnted Sept.29, 1914.

M1 a'. M; 38u/wam@ INI Nonni! Frith! cn.PN01oLlrNo,wAlNlNcroN. Il CMATTHEW VIERENGEIQ, or BROOKLYN, NEW YORK.

CLOSUBEl-FLAP FOR ENVELOPS.

Specification of Letters Patent.

Patented Sept. 29, 1914.

Application tiled June 20, 1913. Serial No. 774,867.

To all 1127i om it may concern lie it known thaty l, Marmi-:w ViaaaNoEL,a citizen of the United States, and a resident of Brooklyn, iu thecounty of Kings and State ot' New York, have invented certain new anduseful Improvements in Closure- Flaps for Finvelops, of which thefollowing is a full and clear specification.

This invention relates to envelops of the type generally known as metalflap or metal stra i envclops.

'l ie primary object of this invention is to provide improved means forsecuring a flexible strip to the envelop, it being customary in devicesof this character to weave said strip into the edge of a flap, said flapbeine adapted to be folded over across the mouth of the envelop, afterwhich the ends of the metal strip are bent around the edges of the bodyof said envelop to retain the flap in sealing position.

One of the objects of the present invention is to provide an improvedconstruction for cnvelops of this character according to which therewill be less waste of material, and according to which those portions ofthe material which are usually thrown away can be utilized to produceuseful and beneficial results in the manner to be hereinafter cxplained.

.Figure 1 is a rear elevation ot an envelop constructed in accordancewith the princi les of my invention. one of the securing aps beingunattached to more clearly illustrate the construction; Fig. 2 is a topplan view of the envelop com leted, and Fig. 3 is a fragmentary planview illustrating the method ot cutting the flaps, together with themetal straps secured thereto.

ln the construction of envelops of the same. general character as thatdisclosed in the following description, the form and methods ofconstructing dies and other parts cooperating therewith, as well as thearrangement of machine parts on envelop machines, make it desirable toconstruct the body of the envelop se )arately from the flap whichcarries the flexible strip or strap, the material of the flap beinusually wra ped about the strap or strip. lVhen finishe the e envelop istherefore provided with a flexible with laterally projecting strap atthe top) oing usually pasted to the wings, the flap rear face of thebody portion of the envelop around and within the edges of the flap. Inconsequence, when the envelop is opened the flexible tension in thestrap at the to tends to retain the flap in a plane while tlie bodyportion of the envelop is deformed, the result being that the Hap iscommonly sepa` rated along its lateral edges from the body portion ofthe envelop` and thus does not serve its function as fully as it should.

In the envelop constructed according to my own invention, the fiaps arecut from a continuous strip as indicated in Fig. 3, simultaneously withthe operation which imparts the desired form to said flaps. Thus it willbe seen that comparatively little material is Wasted, the wastecorresponding to the recesses 6 between the wings 7 and the attachinglobes 8. When the flap with the flexible strap is secured to the body 9of the envelo i, the lobes S are folded around to the front tiace of theenvelop and pasted thereto, as indicated in Figs. l and 2. According tothe well-known method of construction of these portions of the envelop arectangular piece of material is eut out and thrown away. Anotheroperation severs the wrapped strap. Notl only therefore are twooperations required, but portions of the material are thrown away whichare utilized by me in more securely attaching a flexible stra to theenvelop. Furthermm'c, by means o my construction, the flap which holdsthe flexible strap to the envelo need not be made so broad and henceeuablles a considerable saving in material. As shown in Fig. 1, therecesses 6 between the flaps 7 and lobes 8 are rounded atI 12 todistribute the stress which tends to tear the paper at the points 12.

What I claim is:

A. flap-forming attachment for flaplcss envclops comprising a sheet ofmaterial of greater width than the envelop to which it is to beattached, and having o positely disposed recesses, the innermost et gesof which are spaced apart a distance substantially equal to the width ofsaid envelop, said recesses dividing the sheet into portionsconstituting respectively an attaching portion and a Hap-forming;rportion, said recesses providing the attaching portion with lobesadapted to be folded around the lateral edges of the flapless envelop tobc sealed to the outside wall of said envelop opposite to spaced fromsnig attaching portion by subthe face on which the attaching portion isVstantaiully the wxdth ofszud recesses.

to be imposed; and said fhnpff poxrtiom p 1 p w a having n Hexhle metalstrip rolle therein MATTHEW VILRLNGLL' to he folded about the lateral edes of said Witnesses:

envelop when the f'np portion ism envelop WM. A. C'oUnTnAND, closingposition, the edge of said strip being x Henny E. KNIGHT.

Copleu ot this temmen be -abhined :ou: me cents-1mb, by addwsing theCommissioner o! :Patents Washington, D. 0.

